blob: 376004d6cfa4d735db45bd8cfb21645f484d8b71 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
/*
* Sense for softmodem: carrier from demod stub + optional GP7 heuristic.
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include "sense.h"
#include "board_pins.h"
#include "config.h"
#include "afsk_soft.h"
#include "hardware/gpio.h"
#include "pico/stdlib.h"
#include <stdint.h>
static bool g_signal;
static bool g_packet;
static bool g_flag;
static absolute_time_t g_packet_until;
static absolute_time_t g_window_start;
static uint16_t g_edges;
static bool g_last_rxd;
static bool g_hold_valid;
void sense_init(void)
{
g_signal = false;
g_packet = false;
g_flag = false;
g_hold_valid = false;
g_window_start = get_absolute_time();
g_edges = 0;
g_last_rxd = gpio_get(PIN_MODEM_RXD);
}
void sense_poll(void)
{
const s1224_config_t *cfg = config_get();
g_signal = afsk_rx_carrier_active();
bool rxd = gpio_get(PIN_MODEM_RXD);
if (rxd != g_last_rxd) {
g_edges++;
g_last_rxd = rxd;
}
uint32_t win_ms = cfg->packet_window_ms ? cfg->packet_window_ms : 50;
if (absolute_time_diff_us(g_window_start, get_absolute_time()) >=
(int64_t)win_ms * 1000) {
if (g_edges >= cfg->packet_edge_min) {
g_packet_until = make_timeout_time_ms(
cfg->packet_hold_ms ? cfg->packet_hold_ms : 500);
g_hold_valid = true;
}
g_edges = 0;
g_window_start = get_absolute_time();
}
if (g_hold_valid) {
if (time_reached(g_packet_until)) {
g_hold_valid = false;
g_packet = false;
g_flag = false;
} else {
g_packet = true;
}
} else {
g_packet = false;
}
}
bool sense_signal_active(void) { return g_signal; }
bool sense_packet_active(void) { return g_packet; }
bool sense_packet_flag(void) { return g_flag; }
|
